9c4b458d2a
If the id of a `.formulaequationinput input` element contains a special character, then the selector for $preview was silently failing to match the element, because no escaping was happening. This fixes the issue by escaping the id before passing to the jQuery selector function. CSS.escape is the ideal method, but this isn't present in IE or Edge, so we use a fallback borrowed from the new jQuery.escapeSelector method.
common ------ This directory contains common code shared between LMS and CMS, such as Mako templates, CSS, and Coffescript.